503 lines
12 KiB
C
503 lines
12 KiB
C
/*********************************************************************
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*
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* Filename: iriap_event.c
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* Version: 0.1
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* Description: IAP Finite State Machine
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* Status: Experimental.
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* Author: Dag Brattli <dagb@cs.uit.no>
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* Created at: Thu Aug 21 00:02:07 1997
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* Modified at: Wed Mar 1 11:28:34 2000
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* Modified by: Dag Brattli <dagb@cs.uit.no>
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*
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* Copyright (c) 1997, 1999-2000 Dag Brattli <dagb@cs.uit.no>,
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* All Rights Reserved.
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* Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* Neither Dag Brattli nor University of Tromsø admit liability nor
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* provide warranty for any of this software. This material is
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* provided "AS-IS" and at no charge.
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*
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********************************************************************/
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#include <net/irda/irda.h>
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#include <net/irda/irlmp.h>
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#include <net/irda/iriap.h>
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#include <net/irda/iriap_event.h>
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static void state_s_disconnect (struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb);
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static void state_s_connecting (struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb);
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static void state_s_call (struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb);
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static void state_s_make_call (struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb);
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static void state_s_calling (struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb);
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static void state_s_outstanding (struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb);
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static void state_s_replying (struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb);
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static void state_s_wait_for_call(struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb);
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static void state_s_wait_active (struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb);
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static void state_r_disconnect (struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb);
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static void state_r_call (struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb);
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static void state_r_waiting (struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb);
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static void state_r_wait_active (struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb);
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static void state_r_receiving (struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb);
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static void state_r_execute (struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb);
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static void state_r_returning (struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb);
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static void (*iriap_state[])(struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb) = {
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/* Client FSM */
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state_s_disconnect,
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state_s_connecting,
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state_s_call,
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/* S-Call FSM */
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state_s_make_call,
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state_s_calling,
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state_s_outstanding,
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state_s_replying,
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state_s_wait_for_call,
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state_s_wait_active,
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/* Server FSM */
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state_r_disconnect,
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state_r_call,
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/* R-Connect FSM */
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state_r_waiting,
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state_r_wait_active,
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state_r_receiving,
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state_r_execute,
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state_r_returning,
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};
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void iriap_next_client_state(struct iriap_cb *self, IRIAP_STATE state)
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{
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
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self->client_state = state;
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}
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void iriap_next_call_state(struct iriap_cb *self, IRIAP_STATE state)
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{
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
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self->call_state = state;
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}
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void iriap_next_server_state(struct iriap_cb *self, IRIAP_STATE state)
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{
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
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self->server_state = state;
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}
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void iriap_next_r_connect_state(struct iriap_cb *self, IRIAP_STATE state)
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{
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
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self->r_connect_state = state;
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}
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void iriap_do_client_event(struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb)
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{
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
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(*iriap_state[ self->client_state]) (self, event, skb);
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}
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void iriap_do_call_event(struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb)
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{
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
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(*iriap_state[ self->call_state]) (self, event, skb);
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}
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void iriap_do_server_event(struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb)
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{
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
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(*iriap_state[ self->server_state]) (self, event, skb);
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}
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void iriap_do_r_connect_event(struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb)
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{
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
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(*iriap_state[ self->r_connect_state]) (self, event, skb);
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}
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/*
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* Function state_s_disconnect (event, skb)
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*
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* S-Disconnect, The device has no LSAP connection to a particular
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* remote device.
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*/
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static void state_s_disconnect(struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb)
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{
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
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switch (event) {
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case IAP_CALL_REQUEST_GVBC:
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iriap_next_client_state(self, S_CONNECTING);
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IRDA_ASSERT(self->request_skb == NULL, return;);
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/* Don't forget to refcount it -
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* see iriap_getvaluebyclass_request(). */
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skb_get(skb);
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self->request_skb = skb;
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iriap_connect_request(self);
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break;
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case IAP_LM_DISCONNECT_INDICATION:
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break;
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default:
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IRDA_DEBUG(0, "%s(), Unknown event %d\n", __func__, event);
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break;
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}
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}
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/*
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* Function state_s_connecting (self, event, skb)
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*
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* S-Connecting
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*
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*/
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static void state_s_connecting(struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb)
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{
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
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switch (event) {
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case IAP_LM_CONNECT_CONFIRM:
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/*
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* Jump to S-Call FSM
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*/
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iriap_do_call_event(self, IAP_CALL_REQUEST, skb);
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/* iriap_call_request(self, 0,0,0); */
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iriap_next_client_state(self, S_CALL);
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break;
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case IAP_LM_DISCONNECT_INDICATION:
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/* Abort calls */
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iriap_next_call_state(self, S_MAKE_CALL);
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iriap_next_client_state(self, S_DISCONNECT);
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break;
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default:
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IRDA_DEBUG(0, "%s(), Unknown event %d\n", __func__, event);
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break;
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}
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}
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/*
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* Function state_s_call (self, event, skb)
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*
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* S-Call, The device can process calls to a specific remote
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* device. Whenever the LSAP connection is disconnected, this state
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* catches that event and clears up
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*/
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static void state_s_call(struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb)
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{
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IRDA_ASSERT(self != NULL, return;);
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switch (event) {
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case IAP_LM_DISCONNECT_INDICATION:
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/* Abort calls */
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iriap_next_call_state(self, S_MAKE_CALL);
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iriap_next_client_state(self, S_DISCONNECT);
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break;
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default:
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IRDA_DEBUG(0, "state_s_call: Unknown event %d\n", event);
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break;
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}
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}
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/*
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* Function state_s_make_call (event, skb)
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*
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* S-Make-Call
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*
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*/
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static void state_s_make_call(struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb)
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{
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struct sk_buff *tx_skb;
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IRDA_ASSERT(self != NULL, return;);
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switch (event) {
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case IAP_CALL_REQUEST:
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/* Already refcounted - see state_s_disconnect() */
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tx_skb = self->request_skb;
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self->request_skb = NULL;
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irlmp_data_request(self->lsap, tx_skb);
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iriap_next_call_state(self, S_OUTSTANDING);
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break;
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default:
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IRDA_DEBUG(0, "%s(), Unknown event %d\n", __func__, event);
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break;
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}
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}
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/*
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* Function state_s_calling (event, skb)
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*
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* S-Calling
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*
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*/
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static void state_s_calling(struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb)
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{
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IRDA_DEBUG(0, "%s(), Not implemented\n", __func__);
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}
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/*
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* Function state_s_outstanding (event, skb)
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*
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* S-Outstanding, The device is waiting for a response to a command
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*
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*/
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static void state_s_outstanding(struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb)
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{
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IRDA_ASSERT(self != NULL, return;);
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switch (event) {
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case IAP_RECV_F_LST:
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/*iriap_send_ack(self);*/
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/*LM_Idle_request(idle); */
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iriap_next_call_state(self, S_WAIT_FOR_CALL);
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break;
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default:
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IRDA_DEBUG(0, "%s(), Unknown event %d\n", __func__, event);
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break;
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}
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}
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/*
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* Function state_s_replying (event, skb)
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*
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* S-Replying, The device is collecting a multiple part response
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*/
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static void state_s_replying(struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb)
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{
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IRDA_DEBUG(0, "%s(), Not implemented\n", __func__);
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}
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/*
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* Function state_s_wait_for_call (event, skb)
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*
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* S-Wait-for-Call
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*
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*/
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static void state_s_wait_for_call(struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb)
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{
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IRDA_DEBUG(0, "%s(), Not implemented\n", __func__);
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}
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/*
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* Function state_s_wait_active (event, skb)
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*
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* S-Wait-Active
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*
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*/
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static void state_s_wait_active(struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb)
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{
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IRDA_DEBUG(0, "%s(), Not implemented\n", __func__);
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}
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/**************************************************************************
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*
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* Server FSM
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*
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**************************************************************************/
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/*
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* Function state_r_disconnect (self, event, skb)
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*
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* LM-IAS server is disconnected (not processing any requests!)
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*
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*/
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static void state_r_disconnect(struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb)
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{
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struct sk_buff *tx_skb;
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switch (event) {
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case IAP_LM_CONNECT_INDICATION:
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tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
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if (tx_skb == NULL) {
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IRDA_WARNING("%s: unable to malloc!\n", __func__);
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return;
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}
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/* Reserve space for MUX_CONTROL and LAP header */
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skb_reserve(tx_skb, LMP_MAX_HEADER);
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irlmp_connect_response(self->lsap, tx_skb);
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/*LM_Idle_request(idle); */
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iriap_next_server_state(self, R_CALL);
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/*
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* Jump to R-Connect FSM, we skip R-Waiting since we do not
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* care about LM_Idle_request()!
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*/
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iriap_next_r_connect_state(self, R_RECEIVING);
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break;
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default:
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IRDA_DEBUG(0, "%s(), unknown event %d\n", __func__, event);
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break;
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}
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}
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/*
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* Function state_r_call (self, event, skb)
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*/
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static void state_r_call(struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb)
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{
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IRDA_DEBUG(4, "%s()\n", __func__);
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switch (event) {
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case IAP_LM_DISCONNECT_INDICATION:
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/* Abort call */
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iriap_next_server_state(self, R_DISCONNECT);
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iriap_next_r_connect_state(self, R_WAITING);
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break;
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default:
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IRDA_DEBUG(0, "%s(), unknown event!\n", __func__);
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break;
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}
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}
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/*
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* R-Connect FSM
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*/
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/*
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* Function state_r_waiting (self, event, skb)
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*/
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static void state_r_waiting(struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb)
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{
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IRDA_DEBUG(0, "%s(), Not implemented\n", __func__);
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}
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static void state_r_wait_active(struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb)
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{
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IRDA_DEBUG(0, "%s(), Not implemented\n", __func__);
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}
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/*
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* Function state_r_receiving (self, event, skb)
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*
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* We are receiving a command
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*
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*/
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static void state_r_receiving(struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb)
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{
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IRDA_DEBUG(4, "%s()\n", __func__);
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switch (event) {
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case IAP_RECV_F_LST:
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iriap_next_r_connect_state(self, R_EXECUTE);
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iriap_call_indication(self, skb);
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break;
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default:
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IRDA_DEBUG(0, "%s(), unknown event!\n", __func__);
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break;
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}
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}
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/*
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* Function state_r_execute (self, event, skb)
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*
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* The server is processing the request
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*
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*/
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static void state_r_execute(struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb)
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{
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IRDA_DEBUG(4, "%s()\n", __func__);
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IRDA_ASSERT(skb != NULL, return;);
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
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switch (event) {
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case IAP_CALL_RESPONSE:
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/*
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* Since we don't implement the Waiting state, we return
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* to state Receiving instead, DB.
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*/
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iriap_next_r_connect_state(self, R_RECEIVING);
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/* Don't forget to refcount it - see
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* iriap_getvaluebyclass_response(). */
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skb_get(skb);
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irlmp_data_request(self->lsap, skb);
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break;
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default:
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IRDA_DEBUG(0, "%s(), unknown event!\n", __func__);
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break;
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}
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}
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static void state_r_returning(struct iriap_cb *self, IRIAP_EVENT event,
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struct sk_buff *skb)
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{
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IRDA_DEBUG(0, "%s(), event=%d\n", __func__, event);
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switch (event) {
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case IAP_RECV_F_LST:
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break;
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default:
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break;
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}
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}
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